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Japan's FY2025 (Reiwa 7) supplementary budget, Cabinet-approved on 26 December 2025, funds a subsidy line administered by METI's Agency for Natural Resources and Energy (ANRE): the "Renewable Energy Expansion: Grid-Connected Storage Battery and Other Power Storage System Introduction Support Project" (saisei kano enerugi donyu kakudai ni muketa keito-yo chikudenchi to no denryoku chozo shisutemu donyu shien jigyo). The METI budget-overview PDF states the line at JPY 8.0 billion in direct appropriation, rising to JPY 61.6 billion when multi-year budgetary commitment authority (kokko-saimu futan koi) is included -- funding that carries the subsidy commitment across future fiscal years without needing fresh annual appropriation. Global Trade Alert separately logs this as one of 23 METI programmes under the FY2026 budget cycle (implementation period 1 April 2026 - 31 March 2027) supporting the "green transformation of the industrial sector," alongside neighbouring lines already filed (hydrogen technology development, resource-circulation resilience, next-generation reactor industrial base, next-generation semiconductor equity investment).
Mechanically, the subsidy targets large-scale power storage systems: batteries connected directly to the grid, batteries co-located with renewable generation assets, demand-side (behind-the-meter) batteries, and long-duration energy storage (LDES) technologies. The stated purpose is to secure decarbonised balancing/adjustment capacity as renewable generation capacity grows (replacing gas-fired peaker balancing) and to increase resilience to energy-price volatility. ANRE opened a public call on 24 December 2025 (submissions due 22 January 2026, briefing session 6 January 2026) to select the executing body (shikko dantai) -- the intermediary organisation that will run the subsidy's application screening, disbursement and compliance process on METI's behalf, following the same delivery model METI uses for its other GX subsidy lines (e.g. GIO for the resource-circulation grant). This FY2025-supplementary-funded round follows a predecessor FY2025 (Reiwa 7) programme of the same name administered via SII (Sustainable Open Innovation Initiative), under which press reporting put the FY2025 annual allocation at roughly JPY 15 billion -- meaning the FY2025-supplementary-plus-FY2026 funding trajectory represents a significant scale-up of this specific storage-subsidy channel.
for lithium-ion (and prospectively LDES/flow-battery) cell and pack suppliers serving the Japanese market -- adjacent to, but distinct from, METI's upstream battery-material recycling subsidy (2025-12-26-japan-meti-fy2026-resource-circulation-resilience-grant) filed the same day.
61.6bn multi-year-commitment total signals METI is locking in a multi-year subsidy pipeline for grid storage rather than a single-year disbursement -- consistent with the sector's capital-intensive, multi-year construction/commissioning cycle for grid-scale BESS projects.
rounds administered via SII/METI ANRE), which has already selected dozens of grid-scale BESS projects in prior fiscal years; this action extends the funding channel into FY2026 under a new executing-body administrator to be selected via the December 2025-January 2026 call.
Innovation Initiative, which ran the FY2025 round) or a newly-selected administrator -- the 24 December 2025 ANRE notice solicits bids for this role but does not name an outcome as of this filing.
predecessor FY2025 SII scheme reportedly covered 50% of installation cost for >=10MW systems with <6h discharge duration, 66% for >6h discharge) was not confirmed for this specific FY2025-supplementary- funded tranche in the sources reviewed.
automated fetches without a browser-like user-agent header (as noted as an open question on the neighbouring FY2026 METI actions filed the same day); both primary URLs above were confirmed reachable via curl with a standard browser User-Agent string from this environment on 2026-07-05.